Analog Devices ADP1046a always read 0xFF

Projects Networking, Protocols, and Devices
1

I am using ADP1046a for high power SMPS.
It is using i2c as communication for programming its EEPROM and Registers.
I want to read the registers but always getting 0xFF as data. Here are my codes.

  for (int cntr = 0; cntr <= 0x80 ; cntr++) {
    Wire.beginTransmission(0x50);
    Wire.write(byte(cntr));
    Wire.endTransmission();
    Wire.requestFrom(0x50, 1);
    Serial.print(cntr, HEX);
    Serial.print(" ");
    while (Wire.available()) { // slave may send less than requested
      char c = Wire.read(); // receive a byte as character
      Serial.println(c, HEX); // print the character
    }
    delay(500);
  }

the slave's output is like shown below:

0 FF
1 FF
2 FF
3 FF
4 FF
5 FF

2

Please post a wiring diagram of how you wired the chip to your Arduino.

What type of Arduino are you using?

You don't read registers with your code but you try different command codes. That's probably the reason you don't get the answer you want. And you don't check the return value of Wire.requestFrom() and Wire.endTransmission(), so you don't know if the call was successful. Did you check if the chip is really listening on address 0x50?

3

Hello,

The communication needed repeated start and I immediately end the transmission and did not do repeated start. My old code from

Wire.endTransmission();

to

Wire.endTransmission(false);

now I am reading perfectly all the registers.
Thanks!